in may, but the city moved the event up in response to the mass shooting at sandy hook elementary in connecticut. and while los angeles has had success in getting guns off the streets, across the country gun sales are up. gun shop owners report that high-capacity magazines and assault rifles are flying off the shelves. why? >> i've seen a huge uptick in business. our a.r.s have been sold out because people are very concerned about them becoming banned. >> one nevada gun shop owner credits president obama with the boost in sales. "obama is the best gun salesman since bill clinton. every too many a liberal opens his mouth and says something stupid about guns, i sell a gazillion of them." need further proof? one iowa reporter went inside a des moines gun shop. >> the most popular is the a.r.-15, one of the weapons used in the sandy hook shooting. >> two days before christmas i maybe have 30 of these. and i had ten in my safes. and now i have zero. >> i'm joined by los angeles mayor antonio villaraigosa. welcome to the show, mr. mayor. >> michael, thank you for having me on. happy holidays to you. >